Method of producing a package

Abstract

The invention relates to a method, in a filling machine, of producing a package with a top of plastic which is injection moulded in the machine and is capped before the top has become configurationally stable. In the method, the capping, at least during a first introductory phase, takes place in that a cap with internal threads is rotated and the package is displaced linearly in a direction towards the cap in such a manner that it may be ensured that the relationship between the speed of rotation of the cap and the speed of displacement of the package substantially correspond to the thread pitch of the threads in the cap and in corresponding threads on the neck when the threads enter into mesh with one another.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of producing a package in a filling machine, the package being provided with an opening device.BACKGROUND ART[0002]Within the food industry, it is common practice to pack drinks and other products with high viscosity in packages manufactured from packaging laminates comprising a core layer of paper or paperboard and one or more barrier layers of, for example, plastic.[0003]One common package type is manufactured in a filling machine in that flat-laid, tube-shaped blanks of the above-described packaging laminate are raised and sealed in their one end in that a top of plastic is injection moulded direct on the end portion. The package is then transported with its open end directed upwards and is filled in a subsequent filling station. In certain cases, the package also passes one or more sterilisation stations before the filling operation. After filling, the open end of the package is folded and sealed. The Applicant marke...

AI Technical Summary

Benefits of technology

The present invention provides a method for producing a package with a tight pouring opening and a short lead time in the machine. The package is sterilized and filled after capping. The method involves producing a sleeve of packaging laminate, injection molding a top of plastic material on the end portion of the sleeve, and capping the neck before the top reaches the stable state. The capping is done by rotating a cap with corresponding internal threads and displacing the package in a direction towards the cap to ensure the relationship between the speed of rotation of the cap and the speed of displacement of the package matches the thread pitch of the threads on the neck and in the cap. This method allows for the efficient production of a tight package with a screw cap while maintaining the design and construction of the original machine in a unchanged state. The speed of rotation of the cap and the speed of displacement of the package are matched to the thread pitch of the threads on the neck and in the cap to prevent deformation of the threads on the neck by compression stresses from the threads in the cap. This results in better control of the tightness between the cap and the neck.

Problems solved by technology

However, this has proved to be fraught with problems.

Above room temperature, the risk is greater that the material will be damaged and lose its form and shape if it is exposed to compression- and tensile stresses.

This sensitivity in the material becomes problematical if the intention is to injection mould a package top and then cap the top just after the injection moulding.

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